Find the Oxidation Number for both Ca and F.
EXPLAIN PLEASE

F= -1 (group 7A)

Ca= +2 (group 2)

Explanation:

oxidation #= # electrons atom gains/loses to form chemical bond

>assigned to atoms in oxidation-reduction rxn to indicate ability to donate/ gain e-

> positive oxidation #= loss of e-, negative= gain of e-

rules:

all group 2 elements (ca) have an oxidation state of 2+

group 7A (F)= -1 charge (needs to gain 1 e- to complete octet)

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.